| 摘要 |
PURPOSE: To decide distribution condition in the anisotropic direction by irradiating a base material with ultrasonic wave. CONSTITUTION: A sample 1 of a base material, is set on a detection table 3 so that the aimed anisotropic direction crosses, at right angle, with an advancement axis U of ultrasonic wave to be irradiated, and two propagation velocities Vx and Vy, in the state where the vibration direction of transverse wave component of ultrasonic wave generated in the sample 1 matches the anisotropic direction and the state where the vibration direction crosses roughly at right angle with the anisotropic direction, are measured with a velocity measuring means 6, and then the difference between both obtained propagation velocities is found by a velocity difference calculating means 7, and based on the velocity difference obtained with the velocity difference calculating means 7, anisotropy of the base material is evaluated. Since distribution state of the anisotropic direction has a close relation with Young's modulus and the propagation velocity of the transverse wave component of the ultrasonic wave has a close relation with Young's modulus, the difference, between the propagation velocity of the transverse wave whose vibration direction almost corresponds with the anisotropic direction and that whose vibration direction almost corresponds with the direction perpendicular to the anisotropic direction, is a numeric value relating to the direction in distribution of the anisotropy. |
